What is the answer to -9=-8+r/(21) ?

The answer to -9=-8+r/(21) is r=-21

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-9=-8+r/(21)

- 9 = - 8 + \frac{r}{21}

r = - 21

Solution steps

- 9 = - 8 + \frac{r}{21}

Switch sides

- 8 + \frac{r}{21} = - 9

Move

8

to the right side

\frac{r}{21} = - 1

Multiply both sides by

21

r = - 21

9 - 10 x = 2 x + 1 - 8 x

A, A + C = 0

\frac{6 a + 1}{9} + 8 a = 7

14 x + 7 = 7 (2 x + 1)

Q, \frac{x ^{3}}{x - 1} = Q + \frac{R}{x - 1}